Answer:
Each conservation law of a given partial differential equation is determined (up to equivalence) by a function known as the characteristic. This function is used to find conservation laws, to prove equivalence between conservation laws, and to prove the converse of Noether's Theorem.
Explanation:
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Answer:
Dams, reservoirs, and aqueducts were constructed throughout the Islamic Empire as early as the tenth century. Muslims also perfected the water wheel, a technique that could be operated by man, animals or the wind.
The tone or pitch of the voice ; the modulation of the voice.
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